A kinetic pressure fluid bearing apparatus is disclosed, which includes a clearance supporting portion formed between a lower end portion of a rotary shaft and a first kinetic pressure generating groove on a surface of a thrust bearing. The clearance supporting portion includes a ball inserting groove formed on any one of the lower end portion of the rotary shaft and the surface of the thrust bearing, and a ball inserted into the ball inserting groove. By such a kinetic pressure fluid bearing apparatus, it is possible to prevent oscillation of the rotary shaft, which occurs when the rotary shaft starts to rotate and stops its rotation. It is also possible to prevent abrasion of the rotary shaft and the thrust bearing due to their friction as well as overload of the rotary shaft by friction. As a result, performance of the product can be improved.